Abstract: Fine-steering mirrors (FSM) are being used in a greater variety of optical systems than ever before. The performance requirements for these systems vary just as widely. It is important for optical system designers, space-based-observation instrument principal investigators, astronomers, tactical weapons seeker designers, and others to understand the capabilities of FSM. It is also necessary for us to be able to specify FSM performance and environments in a manner that effectively communicates system needs to the component manufacturers. If the specification is initially incomplete, major disruption to the program can occur when requirements are understood. This paper introduces the critical and secondary performance and environmental parameters that make up an FSM specification. Also discussed are situations when the various parameters become important. !1
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